Pulverizing-mill.



No. 7U4,650. Patented July l5, I902. "G. S. MAXWELL.

PULVERIZING MILL. 'Jm pumion filed m a, 1901.

(Ho Model.)

UNTTED STATES PATENT OFFICE.

GEORGE S. MAXWELL, OF MADISON, NEW JERSEY, ASSIGNCR OF ONE-HALF TO H. D. ORIPPEN, OF NEW YORK, N.- Y.

PULVERIZING-MILL.

SPECIFICATION forming part of Letters Patent No. 704,650, dated July 15, 1902.

' Application filed July 3,1901. Serial No. 67,002. (No model.)

T all whom it may Co n: contact with the driving-roll and a little Be it known that I, GEORGE S. MAXWELL, above on each side are correspondingly of Madison, in the county of Morris, in the arranged the two supporting-rolls 8 8 on State of New Jersey, have invented new and shafts 9 9, journaled at one or both ends in useful Improvements in Pulverizing-lllills,of boxes 10 10, fitting outwardly and upwardly which the following, taken in connection with inclined ways 11 11, formed in oneor both the accompanying drawings, is a full, clear, side plates, so that the supporting-rolls are and exact description. to a certain extent free to adapt themselves My invention relates to pulverizing'mills to the material passing between them and the :0 in which a free ring is carried on supportingdriving-roll. The supporting-rolls (and also, rolls to crush and pulverize the rock or other preferably, the driving-roll) are formed with material by impact; and it consists in imcylindrical centers or crushing-faces act and provements in construction and mode of opwith tapering ends I) b, and on them is carried eration by which the free ring is better supthe free ring B, formed to fit the rolls with an 15 ported, more certainly driven, a wider range annular crushing-surface 0 equal in width of crushing is obtained, and the work more to the faces a, a, and sides d d, inclined torapidly done, and a simple, compact, ecoward the center, fitting the tapering ends I) Z), nomical, and easily-adjusted millis produced. so that the ring is held in position.

The essential features of my invention are At some convenient point on the case is ar- 20 two corresponding pulverizing-rolls supportranged an external hopper 15, from which exin g the free ring and a driving-roll revolving tends downwardly and inwardly into the in contact with the two rolls; also, a supplespace between the supporting-rolls a chutef, mental pulverizing-roll arranged in contact having an open mouthg, (substantially equal with the inner surface of the free ring and in width to the crushing-face a of the roll,)

25 an adjusting mechanism therefor by which whose side plates are extendedon one sidein the tension on the ring and the pressure bethe direction of the rotation of the drivingtween the ring and all of the rolls is reguroll to fit closely said driving-r0115 and the lated. supporting-roll 8 on that side and the angle My invention will be better understood by between them, so that the material is main- 30 reference to the drawings herewith, in which tained between the cylindrical crushing-surthe letters and numerals of reference used faces of the rolls until it has passed between in the specification indicate the same parts them and does not escape longitudinally over in all the figures. their tapering ends. The material here hav- Figure I is a front elevation of my mill. ing been first crushed falls on an inclined 35 Fig. II is a vertical section through the mill chute h, suitably supported on one or both parallel to Fig. I. Fig. III'is a correspondside plates, which delivers it to the free ring ing section at right angles to Fig. II. Fig. near its lower portion, so that it immediately IV is a plan of the yoke detached; passes under the tension-roll 18, where it is In the figures, A A indicate the side plates further crushed and pulverized. Thence held 0 or halves of the main case, having inwardlyagainst the ring by centrifugal force the ma- 0 extending flanges 1 1, forming the edge of the terial is carried up and around between the case and securely connected together by ring and supporting-rolls continuously until bolts 6 6. The top of the case is preferably it is reduced to the desired mesh, regulated semicircular and the bottom squared and by the tension and speed of the mill. When 5 provided with the integral base 2 2, by which the particles are sufficiently ground, they es- 5 the mill is secured in position. cape through the space between the free ring 3 3 are concentric hearings in the side plates a 1d the integral rings or flanges 19 19 on the for the main shaft 4, on which is supported inner surfaces of the side plates, cut away at within the case the driving-roll 5 and outside 20 to permit the escape of the pulverized ma- 50 the case one or more power-pulleys 7 7. In terial through the opening 40 in the base.

This tension-roll 18 is carried on shaft j, j ournaled in boxes 21 21, sliding in ways 22 22, formed in extensions 23 23 on U-shaped yoke 24, pivotally supported near one edge of the case by both of its free ends on arms 25 25 and extending thence around the other edge of the case, where at its integral end it is ad- 1 justably held in position by screw 28 and nut 29 to regulate the tension applied by the tension-roll to the free ring through springs 31 31, arranged within the ways 22 22, bearing down on the boxes 21 21 and tending to hold the tension-roll against the inner surface of the free ring, whereby a cushion or spring tension is applied to the free ring and to all the rolls in contact therewith. Through said springs and this single adjustable yoke the tension is applied to all the parts at one point and is regulated easily by a single bolt and nut. The tension-roll is also formed with a cylindrical center a and tapering ends I) to fit formed to fit gives a wide bearing-surface for grinding, pulverizing, and driving. The driving-roll not being in contact with the ring maybe formed cylindrically without tapering ends, but preferably, as shown, to be interchanged. In operation the free ring is cushioned on the rolls and held in position cenrolls.

trally by its form and axially by the single yielding tension of the tension-roll, so that it adapts itself to variations in the material and to permit the passage of foreign substances. The arrows indicate direction of rotation of rolls, and the supporting-rolls and the tension-rolls are formed with tapering ends, as aforesaid, to fit and retain in position the free ring, and the driving-roll may be correspondingly formed, as here shown, to be interchangeable, (or cylindrical throughout its entire extent,) for its surface is operative only as far as it lies in contact with the supporting- It would be possible to drive through one of the supporting-rolls,but better by my arrangement, where the fixed driving-roll is arranged in contact with the supporting-rolls indirectly to drive the ring, and the tensionroll is driven from the ring.

The mill has large grinding capacity, having four points for grinding. The material is first crushed to a large extent between the driving-roll and one of the supporting-rolls, where the tension is great. This first crushing reduces the material all practically to the same size before it reaches the free ring, where itis crushed a second time by the tension-roll, and then passes up and around the inner surface of the ring,between that and the two supporting-rolls.

My mill is simple, economical, and of coinparatively few parts. Those are largely interchangeable, for all the rolls, shafts, jourto be assembled.

nal-bearings, and boxes may be made of the same size. Adjustment is easy and for the whole machine may be at a single point. It is practically noiseless, dustless, and with little vibration. It works fast, its feed and discharge are perfectly free, grinds well with any charge or while wet,and cannot be choked. It is easily taken apart and assembled, easily set up in any suitable position, no special foundation being required. It is light, easily transported, may be shipped assembled and completely ready for use orin separate parts It is adjustable while running, durable, the wearing parts lasting indefinitely and not being ground by the dust, and all bolts are outside and visible. It is evenly balanced, cushioned, and equalizing and can be used for any hard material of any fineness without changing the mill. It has a wide range of crushing, for the free ring is supported on two rolls, one-half the weight on each roll. When the tension is released or reduced to its lowest, the crushing is effected by the weight of the ring and that divided by two, and any degree of high tension may be obtained by the adjustment. The ring is carried steadily on the two rolls and is thus driven at two points with little vibration and crystallization.

Having thus described my ii1vention,what I claim, and desire to secure by Letters Patent, is-

1. In a mill, the combination with a free ring, of two rolls supporting said ring, a driving-roll engaging with said supporting-rolls, and means for rotating the driving-roll.

2. In a mill, the combinationwith a suitable case and a free ring supported therein, of-two supporting-rolls carrying the ring, a drivingroll engaging the supporting-rolls, and means for driving the driving-roll.

3. In a mill, the combination with-a suitable case and a free ring arranged therein, of two supporting-rolls journaled in the case and carrying the ring, a driving-roll alsojournaled in the case and engaging with both supporting-rolls, and means for rotating the drivingroll, a tension-roll journaled in the casein contact with the free ring, and means for regulating the pressure of the tension-roll on the ring.

4. In a mill, the combination with asuitable case provided with an opening at the top for the introduction of the material and an opening near the bottom for the outflow of the pulverized material, of a free ring arranged in the case, two supporting-rolls journaled in the case supporting the free ring, a drivingshaft journaled in the case, means for rotating the shaft, and a driving-roll on said shaft arranged in contact with the supporting-rolls.

5. In a mill, the combination with a suitable case and afree ring arranged therein, of three rolls journaled in the case and having their peripheries in contact with the inner surface of the ring, means for exerting a yielding pressure on one of said rolls to regulate the IIO tension of the ring, and a fourth roll engaging with one or more of said rolls to rotate the rolls and the ring.

6. In a mill, the combination with a suitable case having openings for the inflow and outflow of the material, of a free ring arranged in said case, two supporting-rolls journaled in the case and arranged to carry the free ring, a tension-roll also journaled in the case and arranged with its periphery in contact with the inner surface of the ring, means for exerting a variable spring-pressure on said tension-roll to regulate the tension of the ring and the mesh of the material, and a fourth roll also journaled in the case engaging with both supporting-rolls to drive the ring and the rolls, and means for rotating the fourth roll.

7. In a pulverizing-mill, the combination with a suitable case, of two supporting-rolls journaled therein having cylindrical central portions or crushing-surfaces and tapering ends,a free ring supported on said rolls and correspondingly formed with an annular crushing-surface equal in width to the crushingsurface of said rolls and with sides inwardly inclined toward the center, substantially fitting the tapering ends of the rolls, a drivingroll also journaled in the case and arranged to rotate in contact with said supporting rolls, and means for rotating the driving-roll.

8. In a mill, the combination with a suitable case, of two supporting-rolls journaled therein having a cylindrical central portion or crushing-surface and tapering ends, a free ring carried on said rolls and having its inner surface formed with an annular crushingsurface and inwardly-inclined sides to fit said rolls, a driving-roll also journaled in the case and having its periphery in contact with said supporting-rolls, and of a chute for the introduction of the material to be crushed extending from the outside of the case inwardly with a mouth of substantially the same width as the crushing-surface of said supporting-rolls and arranged adjacent to the driving-roll.

9. In a mill, the combination with a suitable case composed of corresponding side plates bolted together, said side plates having outwardly-inclined ways in their upper portion, of boxes arranged to slide in said -ways, shafts journaled in the boxes, supportingrolls on the shafts, a free ring carried on the supporting-rolls, a driving-roll journaled in the side plates and in contact with the supporting-rolls, and means to operate the driveroll.

10. In a mill, the combination with a suitable case, of two supporting-rolls journaled in the case, a free ring carried on the support- I on the shaft within the case and in contact with the inner surface of the free ring,springs engaging the boxes and the support to force downwardly said tension-roll, means to regulate the tension of the springs and thereby of the pressure of the tension-roll on the inner surface of the ring, and means to rotate the rolls.

11. In a mill, the combination with a suitable case composed of corresponding side plates bolted together, said side plates having outwardly-inclined ways in their upper portion, of boxes arranged to slide in said ways, shafts journaled in the boxes, two supporting-rolls on the shafts, a free ring carried on the supporting-rolls, a tension-shaft arranged near the bottom of the free ring and extending outwardly through openings in the case, a suitable support pivotally journaled.

atone end, boxes on said support forming journal-bearings for the shaft, a tension-roll journaled on the shaft within the case and in contact with the inner surface of the free ring; springs engaging the boxes and the support to force downwardly said tensionroll, means to regulate the tension of the springs and thereby of the pressure of the tension-roll on the inner surface of the ring, a driving-roll journaled between the side plates and in contact with the supporting-rolls, and means to rotate the driving-roll.

12. In a mill, the combination with a suitable case, of two supporting-rolls journaled in the case, a free ring carried on said rolls, a driving-roll engaging the supporting-rolls, means for rotating the driving-roll; a single tension-roll arranged within the case in contact with the inner surface of the free ring near its lowest point, a shaft carrying said tension-roll, said shaft extending outwardly through openings in the sides of the case; a yoke pivotally supported on arms on the outside of the case near one edge by its free ends and extending around the other edge of the case, said yoke being formed with vertical' ways, boxes arranged to slide in said ways and forming roller-bearings for the tensionroll shaft, springs arranged within said ways to force said boxes downwardly, and a single bolt and adj usting-nut engaging with the integral end of the yoke to regulate the tension of the springs and the pressure of the tension-roll on the inner surface of the free ring.

13. In a pulverizing-mill, the combination with a case having side plates, and formed with openings for the inflow and outflow of the material, a main shaft journaled between the side plates, a driving-roll arranged on said main shaft within the case; boxes fitted to upwardly and outwardly inclined ways in the side plates above the driving-roll, two supporting-roll shafts extending across the case and journaled in said boxes, supporting-rolls on said shafts in peripheral contact with the driving roll, said supporting rolls being formed with cylindrical centers and taperingends; a free ring sustained on the support ing-rolls and correspondingly formed with an annular central portion and inclined sides inclined in toward the center to fit said supporting-rolls; a U -shaped yoke pivotally supported by its separated ends on integral arms arranged on the base of the case near one edge and extending around the other edge of the case, a single screw and nut secured to the base and engaging with the integral end of the yoke to adjust its position and the tension of the freering on its rolls, integral upward extensions on the legs of the yoke, on each side, formed with ways, boxes fitted to said ways, springs arranged in said ways to bear downwardly on said boxes; a tension-roll shaft journaled in the boxes, a tension-roll on said tension-roll shaft arranged within the case and in contact with the inner surface of the free ring at its lowest point, said tension-roll being of the same size and form as the supporting-rolls, and means to operate the driving-roll.

14. In a mill, the combination with a suitable case, of a free ring arranged in said case, of two supporting-rolls journaled in the case and carrying the ring, a driving-roll also journaled in the case and engaging the supporting-rolls, a yoke pivotally supported outside of the case by its free ends, a tension-roll arranged within the case in contact with the free ring and journaled in said yoke, and a single bolt and adjusting-nut engaging with the integral end of the yoke to regulate the pressure of the tension-roll on the free ring.

15. In a mill, the combination with a suitable ease and free ring supported therein, of two supporting-rolls carrying the ring, a driving-roll engaging the supporting-rolls, means for driving the driving-roll, an external hopper for the material, and a chute extending from the hopper into the interior of the case and terminating in the open mouth arranged adjacent to the driving-roll, said mouth being extended outwardly and downwardly on one side in the direction of rotation of the driving-roll, substantially to fit the drivingroll and one of the supporting-rolls.

16. In a mill, the combination with a free ring, of a plurality of rolls supporting said ring, a driving-roll engaging with one or more of said supporting-rolls, and means for rotating the driving-roll.

In testimony whereof I have hereunto signed my name.

Witnesses:

C. O. SoHoENEcK, E. L. DARLING.' 

